Blanket the entire water surface, causing oxygen depletion – this may destroy the under-surface ecosystem and kill aquatic species
As introduced species, compete with native species and reduce biodiversity
Impact on the aquatic habitat of bird species and cause them to relocate
Interfere with flow in irrigation channels
Interfere with flow in irrigation channels, causing blockages or impeding water intake to pumping equipment – mesh cages may have to be made to house the foot valve away from the weed
Contaminate and taint drinking water supplies
Cause pungent odours
Accumulate debris
Impede the access of stock to water
Increase transpiration rates
Taking action in the early growth stage is important in preventing the problem getting out of control.